My question involves business law in the state of: Illinois, Will County, 60410.

I have a friend who is holding real estate workshops in a commercial building he's renting for 100+ people. The question of masks came up, where he says he's a sole proprietor with an EIN and no business license, therefore he doesn't have to enforce mask wearing in his workshop since he's not a regulated business. I'm trying to make sure he doesn't get in trouble if that's not the case and he gets sued for not requiring masks.

In Will County, either in incorporated or unincorporated areas, are workshops subject to IL mask regulations and the Governor's order, either at the sole proprietor level or at the commercial building level?

Also, does he need a business license to charge money to hold workshops?